Drop-hammer.



I PATENTED APR.30,1907. G. B. LAMB & 1). c. GRIGGS.

DROP HAMMER.

APPLICATION FILED AUG. 21. 1905.

4 SHEETS-SHEET 1.

PATENTED APR. 30, 1907.

v G. B. LAMB & D. U. GRIGGS.

DROP HAMMER.

APPLICATION FILED AUG. 21. 1905.

4 SHEETS-SHEET 2,

THE mum's PETERS ca. WASHINGTON. o c.

PATENTED APR. 30, 190v.- G. B. LAMB & 1). 0. GRIGGS.

DROP HAMMER. APPLICATION FILED AUG. 21, 1905.

4 8HEETSSHEET 3.

PATENTED APR. 30, 1907. G. B. LAMB & D. G. GRIGGS.

DROP HAMMER. APPLICATION FILED AUG. 21, 1905.

4 SHEETS-SHBET 4.

Y AR;

THE NORRIS PETERS co. WASHINGTON a. c.

UNITED STATES PATENT OFFICE.

GEORGE E. LAMB AND mvmfceiccs', or WATERBURY, CONNECTICUT, ASSIGNORS To THE WATERRURY FARRELL FOUNDRY ND MACHINE COMPANY, or WATERBURY, CONNECTICUT, A CORPORATION OF CON- N ECTICUT.

DROP-HAMMER.

Specification of Letters Patent.

Patented April 30, 1907.

Application filed August 21,1905. Serial No. 274,972.

To all whowt it ntay concern:

Be it known that we, GEORGE B. LAMB and DAVID C. GRIGGs, citizens of the United States, residing at l/Vaterbury, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Drop-Hammers, of which the following is a specification, reference being had therein to the accompanying drawings.

Our invention relates to new and useful improvements in drop hammers, and has for its object, among other things, to arrange the friction rolls whereby they may have a uni form parallel adjustment; to construct the lifter frame whereby the number of parts liable to become loosened will be reduced to the minimum; to relieve, and as far as possi ble remove, all of the shock and jar upon the o erative parts; to provide a simple and positlve adjustment for the gripping mechanism; to arrange the same whereby the grip rod will be located at one side of the machine; to provide knock off and lifter dogs that will have the minimum number of parts thereon requiring adjustment; as well as to construct the device of the fewest possible parts so designed as to be readily assembled and pro duce a hammer with the maximum efficiency.

To these, and other ends, our invention consists in the drop hammer having certain details of construction and combination of parts as will be hereinafter described and more articularly pointed out in the claims.

Re erring to the drawings, in which like numerals of reference designate like parts in the several figures Figure 1 is a front view of our improved hammer complete; Fig. 2 is a side elevation thereof; Fig. 3 is an enlarged elevation of the lifter frame and upper portion of the side frames. Fig. 4 is a fragmentary plan view thereof; Fig. 5 is a side elevation of the parts shown in Fig. 3; Fig. 6 is a transverse sectional view of the friction rolls; Fig. 7 is a side elevation of the gripping dogs;

sleeves; Fig. is a plan view of the rock sleeve; Fig. 11 is an enlarged sectional plan view of the side frames taken upon line AB of Fig. 1; Fig. 12 is a side elevation of the Fig. 13 is a plan view of the lifter dog and Fig. 1 4 is a front elevation thereof.

In the practice of our invention we provide Figs. 8 and 9 are plan views of the eccentric knock off dog and-a portion of the hammer;

a base 1, side frames 2, hammer 3, and treadle 4, all of which are constructedin awell known manner. Upon the top of the side frames 2 is the lifter frame, which comprises a base member 5 that is secured to the side frames by the T headed bolts 6 having check nuts 7 thereon, and caps S which are secured to said base member by bolts 9 that pass down through said caps and a portion of the base member and have a key 10 through the lower end thereof and a check nut 11 upon the opposite end with a key 12 passing therethrough above said nut. By this construction it is practically impossible for the nuts upon the lifter frame to jar loose or the lifter frame parts to become separated, as the keys 10 and 12 rigidly look all of the parts together.

Mounted within the uprights 13 integral with the base member 5 are the eccentric sleeves 14 and 15, and within the eccentric sleeves 14 is rotatable the shaft 16 which is driven by a pulley 17 and in the eccentric sleeves is the shaft 18 that is driven by the pulley 19. Upon the shaft 16 between the eccentric sleeves 14 the friction roll 20 is fixed, and upon the shaft 18 is fixed the friction roll 21.

Heretofore it has been the practice to mount the friction roll within a yoke having bearings upon both sides of the friction roll integral with each other, and to have the shaft pass through said yoke and friction roll. This construction necessitated the securing of the friction roll to the shaft after the same had been placed in the yoke, and practice has demonstrated that a tight fit is never made, and that within a comparatively short time the friction roll works loose upon the shaft and an imperfect grip is secured upon the lifter board. In our con struction the friction roll is made fast to the shaft before the same is mounted in its bearings when its accessibility is such as to insure a tight fit that cannot be jarred loose by the operation of the hammer.

Journaled within the base member 5 is a shaft 22 squared at 26 and tapered near one end with a nut threaded thereon and upon which is fixed the pinions 23 which mesh into the sectors 24 integral with the eccentric sleeves 15. To adjust the relative posi tions of the friction rolls toward and away from each other the nut 25 is loosened and the shaft 22 rotated manually by the engagement of a wrench with the squared head 26, which will rotate the eccentric sleeves and bring the friction rolls to the desired posi tion, at which time the nut 25 is again tightened and the eccentric sleeves are locked in their adjusted positions. The action of the gears 23 and eccentric sleeves 15 provide a parallel adjustment for the friction rolls, and overcomes the objections so common in the present type of drop hammer, wherein the friction shaft bearings are adjusted separately, thus making parallel adjustment of the rolls extremely difficult and practically impossible.

The means for gripping the board between the friction rolls comprises a rock sleeve 27 that is fixed upon a shaft 28 journaled in the base member 5 and having the arms 29 and 30 integral therewith; links 21 connecting the arms 29 and 30 with the arms 32 integral with the eccentric sleeves 14 lifter rod 33 pivotally secured at its upper end to the arm 30 and lying in front of the side frame 2 at the right of the machine. The raising and lowering of the'lifter rod 33 imparts a rocking movement to the sleeve 27 and through the arms 30 and 29 to the eccentric sleeves 14, which move the friction roll. 20 toward and away from the friction roll 21 and thus g ipping the hammer board 34 or releasing it according to the direction of movement. The actuation of the friction rolls by the lever mechanism above described practically eliminates the shock and jar from the friction rolls and bearings, and so as to make the touch of the friction rolls upon the board sufficient to actuate the hammer and no more, we have inserted within the base memher 5 wooden blocks 35 upon which the arm 30 rests at the limit of its downward movement. These blocks 35 take the shock caused by the drop of the lifter rod.

The knock off dog 36 is frictionally and adjustably secured to the lifter rod by the bolts 37 and has an angular rear face which is engaged by a knock off pin 38 fixed within the hammer 3. The outer end of the knock off pin 38 is cut off at an angle so as to be parallel with the angular face upon the knock ofi dog 36 (see Fig. 11). As the hammer 3 falls the pin 38 engages the rear cam face of the dog 36 and moves the lifter rod outwardly and off the shelf 39 which is integral with one of the side frames. The lifter dog is designated 40 and is frictionally and adjustably secured to the lifter rod by the bolts 41, this dog having an offset 42 thereon which projects laterally into the path of movement of the hammer 3 and when engaged by the said hammer, as shown in Fig. 13, raises the lifter rod 33 until its lower end is above the shelf 39 when the pull back rod 43, which passes through one of the side frames 2 and has a coil spring 44 surrounding it, draws the lower end of the lifter rod inwardly toward the side frame, at which time it will rest upon the shelf 39 and the hammer will fall as above.

The mechanism for holding the hammer in its elevated position comprises the grip dogs 45 and 46 which are upon either side of the board, as shown in Fig. 4, the grip dog 45 being mounted upon the eccentric shaft 47 journaled in lugs 48 integral with the base member 5 and having a lever 49 fixed to said eccentric shaft, and connected with said lever is the grip rod 50 secured at itslower end to the treadle 4. The grip dog 46 is mounted upon an eccentric shaft 51 which is journaled in the lugs 52 integral with the base frame and having a tapered shank thereon, as shown in Fig. 4.

To adjust the relative positions of the dogs toward and away from each other the nut 53 upon the end of the shaft 51 is loosened and the shaft rotated manually by engagement of a wrench with the hexagonal head 54, and after the desired adjustment is secured the nut 53 is again tightened.

There are minor changes and alterations that can be made within our invention, aside from those herein suggested, and we would therefore have it undestood that we do not limit ourselves to the exact construction. herein shown and described, but claim all that falls fairly within the spirit and scope of our invention.

Having described our invention, what we claim as new, and desire to secure by Letters Patent, is:

1. In a drop hammer, the combination with a frame, of a pair of friction rolls, a movable shaft and a normally fixed shaft for said rolls, eccentric sleeve journals for the shafts of both of said rolls rotatably mounted in said frame, means for rotating the eccentric sleeve journals of the movable shaft to intermittently move its roll toward and away from the normally fixed shaft and its roll at predetermined intervals, geared sectors carried by the eccentric sleeve journals of the normally fixed shaft, an auxiliary shaft arranged parallel with said normally fixed shaft and having a tapering or conical end fitted in a complemental bearing in one side of the frame and its other end rotatably mounted in the opposite side of the frame, gear-wheels secured to said auxiliary shaft and meshing with the geared sectors carried by the eccentric sleeve journals of the normally fixed shaft, means for tightening and loosening the conical end of the auxiliary shaft in its bearing, and means for turning said auxiliary shaft when loosened to rotate the eccentric sleeve journals of the normally fixed shaft and thereby adjust and set the normally fixed shaft and its roll with relation to the movable shaft and its roll.

2. In a drop hammer, the combination lIO with a frame, of a pair of friction rolls, a hammer, a lifter-board for said hammer adapted to be intermittently engaged by said friction rolls for raising and releasing said lifter-board, a pair of grip-dogs adapted to engage said lifter-board to support it in its elevated position, a normally stationary eccentric shaft for one of said grip-dogs having a conical or tapering end fitted in a complemental bearing in one side of the frame and having its other end rotatably mounted in the other side of the frame, and means for tightening and loosening the conical end of said eccentric shaft in its bearing, and means for turning said shaft when loosened, to thereby adjust and set the normally fixed eccentric shaft and its grip-dog with relation to the other grip-dog, and a loosely mounted eccentric shaft for said other grip-dog and means for rotating said shaft to move its gri d0g toward and away from the nor ma ly fixed grip-dog.

3. In a drop hammer, the combination with a frame, of a pair of friction rolls, rotatable eccentric sleeve bearings for the shaft of one of said rolls whereby it may be moved toward and away from the other roll, a rockshaft mounted in bearings upon one side of the frame, arms carried by said rock-shaft 30 and extending toward the opposite side of the frame below said rolls. links connecting said arms with the eccentric sleeve bearings of said roll, one of said arms extending beyond the side of the frame and connected with a lifter-rod, and means for operating said lifter-rod.

4. In a drop hammer, the combination with a frame, of a pair of friction rolls, rotatable eccentric sleeve bearings for the shaft of one of said rolls whereby it may be moved toward and away from the other roll, a rockshaft mounted in bearings upon one side of the frame, arms carried by said rocl shaft and extending toward the opposite sideof the fran'ie below said rolls, links connecting said arms with the eccentric sleeve bearings of said roll, one of said arms extending beyond the side of the frame and connected with a lifter-rod, means for operating. said lifter-rod, and cushion-blocks arranged in said frame beneath and adapted to be engaged by said arms to take the shock caused by the drop of the lifter-rod.

In testimony whereof we allix our signatures in presence of two witnesses.

GEORGE B. LAMB.

DAV 1D 0. (BRIGGS.

\Vitnesses:

J. M. GALLOND, M. J. NOONAN'. 

